ffmpeg -i MVI_6551.MOV -filter_complex \
"[0:v]trim=36:39, crop=720:720:540:0, setpts=PTS-STARTPTS, setpts=.8*PTS, loop=loop=0, split=2 [v1] [reverseMe]; \
 [reverseMe] reverse,setpts=PTS-STARTPTS, setpts=.8*PTS, loop=loop=0 [reverseVideo]; \

 [v1][reverseVideo] concat=n=2:v=1[v] " -map "[v]" -y o6.gif

This works and I want to use palettegen and paletteuse on it.